Tilting burner mount



July 1s, 1967 R. J. BEST ETAL TILTING BURNER MOUNT Filed Sept. 9, 1964INVENTORS ROBERT J.

ROGER BEST' W. TUTH/Ll. BY

bmkkkem A TTOR/VEV United States Patent O 3,331,597 TILTING BURNER MDUNTRobert J. Best, Myersville, and Roger W. Tuthill, Monntainside, NJ.,assignors to Air Reduction Company, In-

corporated, New York, N. a corporation of New York Filed Sept. 9, 1964,Ser. No. 395,212 Claims. (Cl. 266--23) This invention relates toscarfing apparatus in which jets of oxygen are projected against theheated surface of a slab, billet, or other work piece to remove thesurface metal and imperfections therein from the work piece preparatoryto rolling or other operations on the work piece.

During a scarling operation, the burner is held close to the surfacethat is to be scarfed, and it is common practice to have a shoe or otherbearing surface on the burner in position to rub directly on the surfaceof the work piece. The burner is held with the shoe in contact with thework piece by yielding means that permit the burner to move up and downto follow variations in the contour of the work piece surface and tofollow the surface when the Work piece is warped or bent.

The scarng burner is held against movement in the direction of therelative movement of the burner and work piece, and very often anirregular, projecting piece of metal on the work piece will strike aburner and bend or break the burner or the support so that the apparatuscannot be operated again until costly and time-consuming repairs havebeen made.

Conventional scarng apparatus often has a plurality of burners locatedsde-by-side across each surface to be scarfed, and these burners ortheir holders are designed to break away individually from one anotherif struck by metal projecting from a work piece at a location whichcatches on a burner.

It is an object of this invention to provide improved supporting meansfor a scarng burner, and to hinge the supporting means so that theburner can swing against a yielding force that softens the blow andprevents damage to the apparatus if the burner is struck by a metalprojection or other obstruction.

Features of the invention relate to the combination of a spring withspecific operating mechanism and to the particular kind of `spring usedfor yieldably holding a scarng burner in working position; and tolprovision for damping the spring action to prevent oscillation of theburner along the work piece.

Another object is to provide scarfing apparatus having a support foryieldably holding a burner against movement with respect to a supportingmount and in the direction of movement of the work piece, and with otheryielding means for holding the burner and supporting mount assembly inposition to maintain the burner adjacent to the surface of a work pieceon which the burner is operating.

Other objects, features and advantages of the invention will appear orbe pointed out as the description proceeds.

In the drawing, forming a part hereof, in which like referencecharacters indicate corresponding parts in all the views:

FIGURE 1 is a diagrammatic side elevation of scarfing apparatus made inaccordance with this invention; and

FIGURE 2 is a fragmentary rearward view of a portion of the apparatusshown in FIGURE 1.

A slab or work piece 10, which is to be scarfed, is advanced in thedirection indicated by an arrow 12 along a conveyor 14 having rollers 16which support the work piece 10. There is a space Ibetween the rollers16 at a scarng station and a scarng burner 20 is held in a positionadjacent to a bottom surface 22 of the work piece 10. This inventionwill be described in connection with the Iburner 20 which scarfs thebottom surface 22, but it will be understood that there are otherburners for simultaneously scarfing the other sides of the work piece10; and this invention may be applied to these other burners.

The burner 20 directs pre-heating and scarling jets against the workpiece y10 in a direction opposite to the direction of movement of thework piece. The direction of impingement of the jets from the burner 20against the work piece 10 is indicated by the arrow 24 in FIG- URE l.The scarng jets are located along a row extending transversely of thework piece 10 so that the entire bottom surface is scarfed in a `singleoperation.

The scarng burner 20 is supported by a mount or mounting frame 30 havinga relatively-fixed part 32 secured to structure 34 of the scaringapparatus. The mounting frame 30 also has a movable part 36 attached tothe relatively-fixed part 32 by hinge means 40.

The hinge means 40 includes a shaft 42 which serves as a pin for thehinge means. This shaft 42 extends through side portions 44 of themovable part 36 and through a middle portion 46 (FIGURE 2) of therelatively-fixed part 32 of the mounting frame 30. A set u screw 48holds the shaft or pin 42 against axial movement.

The yburner 20 has abracket portion 50 which lits over the upper end ofthe movable part 36 of the mounting frame 30 and the bracket portion 56of the burner is attached to the movable part 36 of the mounting frame30 by fastening means, such as screws S2 (FIGURE 1).

In the preferred construction, the burner 20 has a shoe 56 that rubsalong the bottom surface 22 of the Work piece and the bearing surface ofthe shoe 56 is located behind a plane 58 which extends through the axisof the shaft 42 and at right angles to the bottom surface 22 of the workpiece 10. The entire portion of the burner 20, which is adjacent to thebottom surface 22, is located behind (to the left in FIGURE l) the plane58 so that, if an irregularity extending from the bottom of the workpiece 10 strikes the burner 20 and swings the burner about the axis ofthe shaft or pin y42, the burner moves away from the work piece insteadof jamming against it, as would Ibe the case if the shoe 56 and adjacentportions of the burner were located in front (to the right in FIG- UREl) of the plane 58.

Forward-swinging (clockwise) movement of the burner 20 about the hingeshaft or pin 42 is limited by a block 62 secured to the front of themovable part 36 of the mounting frame 30 by fastening means includingscrews 64. This block 62 extends downward below the shaft 42 and strikesagainst a surface 66 of the relatively-fixed part 32 of the mountingframe 30 so that the mounting Villustrated and described,

frame cannot move any further than into a straight up-V and-downposition when the movable part 36 swings clockwise. There are screws 68threaded through the block 64 for adjusting the heights of the burner 20with, Y respect to the mounting frame 30. These screws 68 are themounting frame 30, by a block 78. This block 78 is held against thespring 74 by screws 89 which extend through the block 78 and spring 74and which thread into the relatively-fixed part 32 of the mounting frame30. A part of the block 78, which extends upward, has a front surface 82that curves away from the spring 74. This curved surface 82 controls thebending of the spring 7S and has the eifect of shortening the free endof the spring 7 4, and thus increasing the spring rate as the springbends toward the left in FIGURE 1. A position of the spring 78, whenbent back by a substantial distance, and adjacent parts of the mountingframe 30, are shown in dotted lines in FIGURE 1. s

Although the part 36 of the mounting frame 30 can be made to beardirectly against the front leaf of the spring 74, the preferredconstruction of the invention has a shim 86 attached to the part 36 ofthe mounting frame 36 by screws 88, and this shim 86 moves along thesurface of the spring 74 as the burner 20 swings counterclockwise inFIGURE l. The extent of this movement is indicated vby a dimension arrow90 in the drawing.

The leaves of the spring 74 also move on each other as the spring bends,since the leaves a-re clamped together only at their lower ends by thescrews Sii. This movement of the shim 86 and movement of the springleaves on one another creates friction for dampening the operation ofthe spring and thus prevents the spring from oscillating and causing theburner 20 to oscillate back and forth with resulting variations in theapplication of the scarling jets to the work piece.

The structure 34 of the scarng apparatus holds Ythe mounting frame 30against movement in the direction in which the work piece travels, butin the preferred construction the structure 34 is movable up and downtoward the work piece so as to carry the burner 26 into contact with thework piece for a scariing operation. The means which hold the burner upagainst the'workpiece are yielding means so that the burner 20 can moveup and down to follow the contour of bent slabs, and provision issometimes made for permitting rocking ofthe burner to follow the contourof a warped slab. Details of this apparatus for holding the burneragainst the work piece are not a part of this invention but it is afeature of the invention and the assembly described can be carried by Ystructure 34 which is movable up and down by yielding means formaintaining the burner 20 in contact with the work piece. VAlthough thestructure 34 is held against movement in the direction of movement ofthe work piece 10, and against transverse movement, it can only be de- Yscribed as relatively-fixed or relatively-stationary, be-

cause of its up-and-down movement.

FIGURE l shows diagrammatically a mechanism for raising and lowering thestructure 34. This `structure is shown connected to a fixed element 94by a pivot c-onnection 96; and there is a cylinder-and-piston motor 98which is supplied with working uid through piping 102 and 104 to movethe structure 34 angularly about the pivot connection 96. Valves 106 areoperated to control the supply and exhaust of working fluid in thepiping 192 `and 104 to control the operation-of the cylinder-andpistonmotor 93.

The preferred embodiment of the invention has been but changes andmodications can be made and some features may be used in dierentcombinations without departing from the invention as defined in theclaims.

We claim: Y

1. A scarng apparatus comprising a scarling burner mounting means, ascariing burner which directs oxygen jets against the work piece in adirection substantially opposite to the movement of the work piece, saidburner attached to said mounting means and having a work piece abuttingsurface, said mounting means including a mounting'frame comprising arelatively-fixed part, and a movable part having mounted thereon saidscarng burner, hinge means by which the movable part is attached to therelatively-fixed part of the frame, the hinge means having an axisextending transversely of the direction of movement of a work piece withrespect to said burner and positioned in a plane normal to the workpiecesurface Yat the lmost forward point of contact between the work pieceand said abutting surface of said burner or forward thereof, and springmeans yieldably resisting the swinging of the movable part in adirection to permit said burner to move for a limited distance with awork piece having an irregular portion that strikes against the burnerVduring a scarng operation.

2. The scarfing apparatus described in claim 1 characterized by thespring means being oriented to resist rea-rward movement of the movablepart, and an adjustable stop for limiting forward movement of saidmovable partof the frame by said spring means.

3. The scarng apparatus described in claim 1 characn terized by thespring means including a leaf-spring, a portion of which extends behindlthe movable part of the mounting frame and another portion ofgwhichextends behind the relatively-fixed part of the mounting frame.

' 4. The scariing apparatus described in claim 3 characterized by anabutment surface behind the spring and extending behind the portion ofthe spring that is behind the movable part of the mounting frame andcurving awayV mounting frame.

6. In scariing apparatus inwhich a work piece moves with respect to ascarng burner that directs oxygen jets against the work piece in adirection substantiallyV opposite to the movement of the work piece withrespect to theV burner, a burner, a supporting frame for the burner, apivot by which the supporting frame is connected with a relativelystationary part of the apparatus and on which the supporting frameswings rearward in the direction that the work piece is moving torelieve shock on the burner as it is struck by an 4irregularity of thework piece,

spring means for returning the burner to its forward posi-y tion afterthe irregularity passes, and a stop for determining the forward positionof the support.

7. The scarng apparatus described 1n claim 6 characterized by a conveyoralong which successive work pieces travel, means holding the relativelystationary part of the apparatus in position to hold the burner incontact with the surface ofthe work piece to be scarfed, thestop fordetermining the forward position of "the support being Y on therelatively stationary part Vof the apparatus.

S. The scarng apparatus described in claim 7 characterized by the stopfor determining the forward positionk of the support being adjustable tovary the forward position of the burner with respect to the apparatus,and the means for holding the relatively stationary part of theapparatus in position being a yielding means having movement forshifting the burner support toward and from the work piece but havingmeans holding it against shifting in the direction in which the.supporting frame swings rearwardly. n

9. The scariing apparatus described in claim 8 charac- 5 6 terzed by thespring being a leaf-spring and the support References Cited having anabutment surface that slides on the leaf-spring as the spring bends,whereby movement of the spring is UNITED STATES PATENTS damped toprevent oscillation of the burner. 2,282,397 5 1942 Deck 266-5 X 10. Thescarn-g apparatus described in claim 6 charac- 5 2,547,993 4/ 1951 Benz.terized by a conveyor along which the work pieces travel, 2,312,17411/1957 Garrison 266-.23 X

the scarng burner having a surface thereon which bears against a surfaceof a Work piece on the conveyor during JOHN R C AMPBELL Pfl-mm3,Examl-eh relative movement of the Work piece and the burner, saidsurface of the burner being located rearward of a plane 10 R. D.DROPKIN, Assistant Examiner. intersecting the axis of the pivot andnormal to the work piece surface.

6. IN SCARFING APPARATUS IN WHICH A WORK PIECE MOVES WITH RESPECT TO ASCARFING BURNER THAT DIRECTS OXYGEN JETS AGAINST THE WORK PIECE IN ADIRECTION SUBSTANTIALLY OPPOSITE TO THE MOVEMENT OF THE WORK PIECE WITHRESPECT TO THE BURNER, A BURNER, A SUPPORTING FRAME FOR THE BURNER, APIVOT BY WHICH THE SUPPORTING FRAME IS CONNECTED WITH A RELATIVELYSTATIONARY PART OF THE APPARATUS AND ON WHICH THE SUPPORTING FRAMESWINGS REARWARD IN THE DIRECTION THAT THE WORK PIECE IS MOVING TORELIEVE SHOCK ON THE BURNER AS IT IS STRUCK BY AN IRREGULARITY OF THEWORK PIECE, SPRING MEANS FOR RETURNING THE BURNER TO ITS FORWARDPOSITION AFTER THE IRREGULARITY PASSES, AND A STOP FOR DETERMINING THEFORWARD POSITION OF THE SUPPORT.